<?php
/**
 *
 * Adapted to Cakephp Shortcode Helper
 * @modified Eugenio Fage
 *
 *
 * WordPress API for creating bbcode like tags or what WordPress calls
 * "shortcodes." The tag and attribute parsing or regular expression code is
 * based on the Textpattern tag parser.
 *
 * A few examples are below:
 *
 * [shortcode /]
 * [shortcode foo="bar" baz="bing" /]
 * [shortcode foo="bar"]content[/shortcode]
 *
 * Shortcode tags support attributes and enclosed content, but does not entirely
 * support inline shortcodes in other shortcodes. You will have to call the
 * shortcode parser in your function to account for that.
 *
 * {@internal
 * Please be aware that the above note was made during the beta of WordPress 2.6
 * and in the future may not be accurate. Please update the note when it is no
 * longer the case.}}
 *
 * To apply shortcode tags to content:
 *
 * <code>
 * $out = do_shortcode($content);
 * </code>
 *
 * @link http://codex.wordpress.org/Shortcode_API
 */


class Shortcode extends AppHelper{

	/**
	 * Container for storing shortcode tags and their hook to call for the shortcode
	 *
	 * @name $shortcode_tags
	 * @var array
	 */
	protected static $shortcode_tags = array();
	

	/**
	 * Add hook for shortcode tag.
	 *
	 * There can only be one hook for each shortcode. Which means that if another
	 * plugin has a similar shortcode, it will override yours or yours will override
	 * theirs depending on which order the plugins are included and/or ran.
	 *
	 * Simplest example of a shortcode tag using the API:
	 *
	 * <code>
	 * // [footag foo="bar"]
	 * function footag_func($atts) {
	 * 	return "foo = {$atts[foo]}";
	 * }
	 * add_shortcode('footag', 'footag_func');
	 * </code>
	 *
	 * Example with nice attribute defaults:
	 *
	 * <code>
	 * // [bartag foo="bar"]
	 * function bartag_func($atts) {
	 * 	extract(shortcode_atts(array(
	 * 		'foo' => 'no foo',
	 * 		'baz' => 'default baz',
	 * 	), $atts));
	 *
	 * 	return "foo = {$foo}";
	 * }
	 * add_shortcode('bartag', 'bartag_func');
	 * </code>
	 *
	 * Example with enclosed content:
	 *
	 * <code>
	 * // [baztag]content[/baztag]
	 * function baztag_func($atts, $content='') {
	 * 	return "content = $content";
	 * }
	 * add_shortcode('baztag', 'baztag_func');
	 * </code>
	 *
	 * @since 2.5
	 * @uses $shortcode_tags
	 *
	 * @param string $tag Shortcode tag to be searched in post content.
	 * @param callable $func Hook to run when shortcode is found.
	 */
	function add_shortcode($tag, $func=null) {
		if(is_array($tag)){
			foreach ($tag as $code){
				
				$this->add_shortcode($code[0], $code[1]);
			}
		}else if ( is_callable($func) ){
			self::$shortcode_tags[$tag] = $func;
		}
		return $this;
	}
	/**
	 * Removes hook for shortcode.
	 *
	 * @since 2.5
	 * @uses $shortcode_tags
	 *
	 * @param string $tag shortcode tag to remove hook for.
	 */
	function remove_shortcode($tag) {
		unset(self::$shortcode_tags[$tag]);
		return $this;
	}

	/**
	 * Clear all shortcodes.
	 *
	 * This function is simple, it clears all of the shortcode tags by replacing the
	 * shortcodes global by a empty array. This is actually a very efficient method
	 * for removing all shortcodes.
	 *
	 * @since 2.5
	 * @uses $shortcode_tags
	 */
	function remove_all_shortcodes() {
		self::$shortcode_tags = array();
		return $this;
	}

	
	public function doShortcode($content){
		$content=$this->_beforeShortcode($content);
		$content=$this->do_shortcode($content);
		$content=$this->_afterShortcode($content);
		
		return $content;
	}
	
	protected function _beforeShortcode($content){
		return $content;
	}
		
	protected function _afterShortcode($content){
		return $content;
	}
		
	
	/**
	 * Search content for shortcodes and filter shortcodes through their hooks.
	 *
	 * If there are no shortcode tags defined, then the content will be returned
	 * without any filtering. This might cause issues when plugins are disabled but
	 * the shortcode will still show up in the post or content.
	 *
	 * @since 2.5
	 * @uses $shortcode_tags
	 * @uses get_shortcode_regex() Gets the search pattern for searching shortcodes.
	 *
	 * @param string $content Content to search for shortcodes
	 * @return string Content with shortcodes filtered out.
	 */
	protected function do_shortcode($content) {
		if (empty(self::$shortcode_tags) || !is_array(self::$shortcode_tags)){
			return $content;
		}
		
		$pattern = $this->get_shortcode_regex();
		return preg_replace_callback('/'.$pattern.'/s', array(&$this, 'do_shortcode_tag'), $content);
	}

	/**
	 * Retrieve the shortcode regular expression for searching.
	 *
	 * The regular expression combines the shortcode tags in the regular expression
	 * in a regex class.
	 *
	 * The regular expresion contains 6 different sub matches to help with parsing.
	 *
	 * 1/6 - An extra [ or ] to allow for escaping shortcodes with double [[]]
	 * 2 - The shortcode name
	 * 3 - The shortcode argument list
	 * 4 - The self closing /
	 * 5 - The content of a shortcode when it wraps some content.
	 *
	 * @since 2.5
	 * @uses $shortcode_tags
	 *
	 * @return string The shortcode search regular expression
	 */
	function get_shortcode_regex() {
		$tagnames = array_keys(self::$shortcode_tags);
		$tagregexp = join( '|', array_map('preg_quote', $tagnames) );

		// WARNING! Do not change this regex without changing do_shortcode_tag() and strip_shortcodes()
		return '(.?)\[('.$tagregexp.')\b(.*?)(?:(\/))?\](?:(.+?)\[\/\2\])?(.?)';
	}

	/**
	 * Regular Expression callable for do_shortcode() for calling shortcode hook.
	 * @see get_shortcode_regex for details of the match array contents.
	 *
	 * @since 2.5
	 * @access private
	 * @uses $shortcode_tags
	 *
	 * @param array $m Regular expression match array
	 * @return mixed False on failure.
	 */
	function do_shortcode_tag( $m ) {
		// allow [[foo]] syntax for escaping a tag
		if ( $m[1] == '[' && $m[6] == ']' ) {
			return substr($m[0], 1, -1);
		}

		$tag = $m[2];
		$attr = $this->shortcode_parse_atts( $m[3] );

		if ( isset( $m[5] ) ) {
			// enclosing tag - extra parameter
			return $m[1] . call_user_func( self::$shortcode_tags[$tag], $attr, $m[5], $tag ) . $m[6];
		} else {
			// self-closing tag
			return $m[1] . call_user_func( self::$shortcode_tags[$tag], $attr, NULL,  $tag ) . $m[6];
		}
	}

	/**
	 * Retrieve all attributes from the shortcodes tag.
	 *
	 * The attributes list has the attribute name as the key and the value of the
	 * attribute as the value in the key/value pair. This allows for easier
	 * retrieval of the attributes, since all attributes have to be known.
	 *
	 * @since 2.5
	 *
	 * @param string $text
	 * @return array List of attributes and their value.
	 */
	function shortcode_parse_atts($text) {
		$atts = array();
		$pattern = '/(\w+)\s*=\s*"([^"]*)"(?:\s|$)|(\w+)\s*=\s*\'([^\']*)\'(?:\s|$)|(\w+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|(\S+)(?:\s|$)/';
		$text = preg_replace("/[\x{00a0}\x{200b}]+/u", " ", $text);
		if ( preg_match_all($pattern, $text, $match, PREG_SET_ORDER) ) {
			foreach ($match as $m) {
				if (!empty($m[1]))
				$atts[strtolower($m[1])] = stripcslashes($m[2]);
				elseif (!empty($m[3]))
				$atts[strtolower($m[3])] = stripcslashes($m[4]);
				elseif (!empty($m[5]))
				$atts[strtolower($m[5])] = stripcslashes($m[6]);
				elseif (isset($m[7]) and strlen($m[7]))
				$atts[] = stripcslashes($m[7]);
				elseif (isset($m[8]))
				$atts[] = stripcslashes($m[8]);
			}
		} else {
			$atts = ltrim($text);
		}
		return $atts;
	}

	/**
	 * Combine user attributes with known attributes and fill in defaults when needed.
	 *
	 * The pairs should be considered to be all of the attributes which are
	 * supported by the caller and given as a list. The returned attributes will
	 * only contain the attributes in the $pairs list.
	 *
	 * If the $atts list has unsupported attributes, then they will be ignored and
	 * removed from the final returned list.
	 *
	 * @since 2.5
	 *
	 * @param array $pairs Entire list of supported attributes and their defaults.
	 * @param array $atts User defined attributes in shortcode tag.
	 * @return array Combined and filtered attribute list.
	 */
	function shortcode_atts($pairs, $atts) {
		$atts = (array)$atts;
		$out = array();
		foreach($pairs as $name => $default) {
			if ( array_key_exists($name, $atts) )
			$out[$name] = $atts[$name];
			else
			$out[$name] = $default;
		}
		return $out;
	}

	/**
	 * Remove all shortcode tags from the given content.
	 *
	 * @since 2.5
	 * @uses $shortcode_tags
	 *
	 * @param string $content Content to remove shortcode tags.
	 * @return string Content without shortcode tags.
	 */
	function strip_shortcodes( $content ) {

		if (empty(self::$shortcode_tags) || !is_array(self::$shortcode_tags))
		return $content;

		$pattern = $this->get_shortcode_regex();

		return preg_replace('/'.self::$pattern.'/s', '$1$6', $content);
	}
}